飞秒
光学
折射率
材料科学
激光器
表面微加工
激光束
梁(结构)
超短脉冲
椭圆偏振法
自聚焦
激光束质量
光电子学
物理
薄膜
纳米技术
病理
替代医学
制作
医学
作者
Lin Zhang,Shiyuan Liu,Zhicheng Zhong,Hao Jiang,Honggang Gu,Xiuguo Chen,Shiyuan Liu
标识
DOI:10.1088/2040-8986/abfc5b
摘要
Abstract Femtosecond laser-induced optical and structural changes inside transparent materials are crucial to ultrafast laser micromachining. In this work, on-axis beam collapse has been predicted by theoretical simulations and further demonstrated by the experimental results where a femtosecond pulse was loosely focused into a fused silica with the energy far above the self-focusing threshold. A detailed discussion of the energy thresholds and the starting locations on the optical axis of beam collapse for different beam waist radiuses is given. In addition, the spatial distribution of the refractive index has been determined using a spectroscopic ellipsometer and a roughly uniform decrease of 0.1 has been observed in the laser-modified region. Further, the relationship between the spatial distribution of the refractive index and the pulse energy density has been discussed quantitatively. The observed modulation of the beam collapse and the refractive index distribution can be expected to be a useful tool for femtosecond laser micromachining.
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